<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./css/inputnumber.css" />
    <link rel="stylesheet" href="./css/index.css" />
    <title>购物车</title>
  </head>
  <body>
    <div class="app-container" id="app">
      <!-- 顶部banner -->
      <div class="banner-box"><img src="http://autumnfish.cn/static/fruit.jpg" alt="" /></div>
      <!-- 面包屑 -->
      <div class="breadcrumb">
        <span>🏠</span>
        /
        <span>购物车</span>
      </div>
      <!-- 购物车主体 -->
      <div class="main" v-if="fruitList.length > 0">
        <div class="table">
          <!-- 头部 -->
          <div class="thead">
            <div class="tr">
              <div class="th">选中</div>
              <div class="th th-pic">图片</div>
              <div class="th">单价</div>
              <div class="th num-th">个数</div>
              <div class="th">小计</div>
              <div class="th">操作</div>
            </div>
          </div>
          <!-- 身体 -->
          <div class="tbody">
            <div class="tr active" v-for="item in fruitList" :key="item.id">
              <div class="td">
                <input
                  type="checkbox"
                  v-model="item.isChecked"
                />
              </div>
              <div class="td"><img :src="item.icon" alt="" /></div>
              <div class="td">{{ item.price }}</div>
              <div class="td">
                <div class="my-input-number">
                  <button class="decrease" @click="hSub(item.id)"> - </button>
                  <span class="my-input__inner">{{ item.num }}</span>
                  <button class="increase" @click="hAdd(item.id)"> + </button>
                </div>
              </div>
              <div class="td">{{ item.price * item.num }}</div>
              <div class="td" @click="hDel(item.id)"><button>删除</button></div>
            </div>
          </div>
        </div>
        <!-- 底部 -->
        <div class="bottom">
          <!-- 全选 -->
          <label class="check-all">
            <input type="checkbox" v-model="isAll" />
            全选
          </label>
          <div class="right-box">
            <!-- 所有商品总价 -->
            <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{ total }}</span></span>
            <!-- 结算按钮 -->
            <button class="pay">结算( {{ allCount }} )</button>
          </div>
        </div>
      </div>
      <!-- 空车 -->
      <div class="empty" v-else>🛒空空如也</div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
      const defaultFruitList = [
        {
              id: 1,
              icon: 'http://autumnfish.cn/static/火龙果.png',
              isChecked: true,
              num: 2,
              price: 6,
            },
        {
              id: 2,
              icon: 'http://autumnfish.cn/static/荔枝.png',
              isChecked: false,
              num: 7,
              price: 20,
            },
        {
              id: 3,
              icon: 'http://autumnfish.cn/static/榴莲.png',
              isChecked: false,
              num: 3,
              price: 40,
            },
        {
              id: 4,
              icon: 'http://autumnfish.cn/static/鸭梨.png',
              isChecked: true,
              num: 10,
              price: 3,
            },
        {
              id: 5,
              icon: 'http://autumnfish.cn/static/樱桃.png',
              isChecked: false,
              num: 20,
              price: 34,
            },
      ];
      const app = new Vue({
        el: '#app',
        data: {
          // 水果列表
          fruitList: JSON.parse(localStorage.getItem('fruitList')) || defaultFruitList,
          
        },
        methods: {
          hAdd(id) {
            const findFruit = this.fruitList.find(item => item.id === id)
            findFruit.num++
          },
          hSub(id) {
            const findFruit = this.fruitList.find(item => item.id === id)
            if (findFruit.num <= 0) return; 
            findFruit.num--
          },
          hDel(id) {
            const filter = this.fruitList.findIndex(item => item.id === id)
            this.fruitList.splice(filter, 1)
          },
          hclick(id) {
            const findFruit = this.fruitList.find(item => item.id === id)
          },
        },
        computed: {
          isAll: {
            set(value) {
              this.fruitList.forEach(item => item.isChecked = value);
            },
            get() {
              const res = this.fruitList.every(item => item.isChecked);
              return res;
            }
          },
          total() {
            const total = this.fruitList.reduce((prev, item) => {
              return item.isChecked ? prev += item.num * item.price : prev
            }, 0)
            return total
          },
          allCount() {
            const total = this.fruitList.reduce((prev, item) => {
              return item.isChecked ? prev += item.num : prev
            }, 0)
            return total
          }
        },
        watch: {
          fruitList: {
            handler (value) {
              localStorage.setItem('fruitList', JSON.stringify(value))
            },
            deep: true,
          }
        }
      })
    </script>
  </body>
</html>
